Description:
------------
When using imagecopyresampled on a CentOS 5.3 and PHP 5.2.9 (also 
tried the 5.3 snapshot) multi-colored pixels are sprinkled onto the 
image.  Running the same function in a loop produces a different image 
every time using the same input.

I could not reproduce the issue on another CentOS 5.3 machine so I 
think it could be related to the floating point unit on the box.  Here 
is the cpuinfo:

processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 6
model		: 8
model name	: AMD Athlon(tm) XP 2000+
stepping	: 1
cpu MHz		: 1662.500
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 1
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca 
cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up 
nonstop_tsc ts
bogomips	: 3326.67


To work around the issue for now, I changed the resample function in 
the bundled gd library to use floats instead of doubles, and then used 
the compiler flags -msse -mfpmath=sse to force the use of the SSE unit 
instead of the built in FPU.  This produced clean images!

In the GCC documentation, this model of CPU doesn't support doubles 
for SSE instructions so that is why I changed them to floats.





Reproduce code:
---------------
<?php
$img = imagecreatefromjpeg("photo.jpg");
list($img_width, $img_height, $img_type, $img_attr) = getimagesize("photo.jpg");
$new_width = 300;
$new_height = 400;
for ($i = 0; $i < 10; $i++) {
	$nimg = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled ($nimg, $img, 0, 0, 1, 1, $new_width, $new_height, $img_width - 2, $img_height - 2);
	imagejpeg($nimg, "output$i.jpg", 80);
	imagedestroy($nimg);
}
?>



Expected result:
----------------
Resized photos without noise.  Here is the original photo used in the 
resample:

http://bit.ly/yfS5w




Actual result:
--------------
Resized photo with noise, result is different each time.  Here are three 
examples:

http://bit.ly/SOzNV

http://bit.ly/oXUsm

http://bit.ly/6gsCP